Abstract: A method and apparatus for power and/or heat generation from fuels. The fuel is fed to a combustion chamber and a pressurized gaseous oxidizing agent is fed to the combustion chamber to fire the fuel in a fluidized bed. The smoke gases coming from the fluidized bed are cooled, purified in a purifier such as an electrostatic filter, reheated in a heat exchanger immersed into the fluidized bed and fed to the gas turbine. The exhaust gas from the gas turbine is fed to a recuperator for gaining the residual thermal energy and is then released through a chimney. The cooling of the smoke gas can be achieved by adding compressed air to the smoke gas stream or by introduction, e.g. into the upper half of the combustion chamber of a water or steam operated heat exchanger.